I liked the plugin. Really useful. One feedback that I have is, can't we have ajax support for this. Every time I save, it does the whole page reload, and I have to search where I was. This could be a great addition to the plugin.

Code Snippets is really one of the best plugin I came across as a developer.
You have a central repository of all individual functions that you add to your theme, or for overriding a plugin's function.
You can have about anything in it that you'd normally put into function.php, with the added bonus of running it only on front end, back end, or both.
You can turn on or off a each snippet with a single click, you can export those snippets and reuse them on another site with the built-in import function
You can even make a parse error in your code without breaking the site, a failsafe will deactivate faulty code and warn you when you save
Besides the developer is nice and replies willingly to inquiries.
All in all this plugin changed completely my approach to developing functionalities for sites I work on, and all for the better.

Make the title of each snippet on the manage page a clickable link to edit the snippet (#)

Added nonce to edit snippet page

Hide row actions on manage snippet page by default

Removed screenshots from plugin

Improved CodeMirror implementation

Added a fallback MP6 icon

Use the proper WordPress database APIs all of the time

Rewritten export functionality

Fixed incorrect export filename

Updated CodeMirror to version 3.19

Removed CodeMirror bundled with plugin

Updated WordPress.org plugin banner

Fixed CodeMirror incompatibility with the WP Editor plugin

Fixed CodeMirror incompatibility with the Debug Bar Console plugin

1.8.1.1 (18 Aug 2013)

1.8.1 (29 July 2013)

Compiled all CodeMirror scripts into a single file

Use Sass + Compass for CSS

Use Grunt for build automation

Minify CSS

Fixed code typo that was breaking export files

Updated CodeMirror to 3.15

1.8 (9 July 2013)

Allow no snippet name or code to be set

Prevented an error on fresh multisite installations

Refactored code to use best practices

Improved database table creation method: on a single-site install, the snippets table will always be created. On a multisite install, the network snippets table will always be created; the site-specific table will always be created for the main site; for sub-sites the snippets table will only be created on a visit to a snippets admin page.